Coffee machine



FIG. 1 is a perspective, front view of a coffee machine from above, showing my design;

FIG. 2 is a front view of the appliance;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a coffee machine, as shown and described. 